Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Em que data a pesquisa mostrou John Kennedy com 45% e Mary Landrieu com 38%?
 ###Tabelas: CREATE TABLE  (_id AUTO_INCREMENT PRIMARY KEY, Poll Source VARCHAR, Dates administered VARCHAR, Democrat: Mary Landrieu VARCHAR, Republican: John Kennedy VARCHAR, Lead Margin INT) CREATE TABLE youth_competitions (youth_competitions_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Competition VARCHAR, Location VARCHAR, Home Team VARCHAR, Result VARCHAR, Away Team VARCHAR) CREATE TABLE current_and_past_rates (current_and_past_rates_id AUTO_INCREMENT PRIMARY KEY, From VARCHAR, Adult Rate VARCHAR, Development Rate VARCHAR, 16-17 Year Olds Rate VARCHAR, Apprentice Rate VARCHAR) CREATE TABLE state_house (state_house_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Party VARCHAR, Hometown VARCHAR, District VARCHAR, Term VARCHAR, Legislatures VARCHAR) CREATE TABLE immigration_by_state (immigration_by_state_id AUTO_INCREMENT PRIMARY KEY, North Carolina VARCHAR, 273.7% VARCHAR, South Carolina VARCHAR, 132.1% VARCHAR, Mississippi VARCHAR, 95.8% VARCHAR, Wisconsin VARCHAR, 59.4% VARCHAR, Vermont VARCHAR, 32.5% VARCHAR)  
SELECT Dates administered FROM  WHERE Republican: John Kennedy = 45% AND Democrat: Mary Landrieu = 38%